Exogenous supply of glutamine and active cytokinin to the roots reduces NO3- uptake rates in poplar.
Identifieur interne : 003E21 ( Main/Exploration ); précédent : 003E20; suivant : 003E22Exogenous supply of glutamine and active cytokinin to the roots reduces NO3- uptake rates in poplar.
Auteurs : Paulina Dluzniewska [Allemagne] ; Arthur Gessler ; Stanislav Kopriva ; Miroslav Strnad ; Ondrej Novák ; Henriette Dietrich ; Heinz RennenbergSource :
- Plant, cell & environment [ 0140-7791 ] ; 2006.
Descripteurs français
- KwdFr :
- Azote (métabolisme), Cytokinine (pharmacologie), Facteurs temps (MeSH), Glutamate-ammonia ligase (métabolisme), Glutamine (pharmacologie), Nitrate reductase (métabolisme), Nitrates (métabolisme), Populus (effets des médicaments et des substances chimiques), Populus (métabolisme), Racines de plante (effets des médicaments et des substances chimiques), Xylème (métabolisme).
- MESH :
- effets des médicaments et des substances chimiques : Populus, Racines de plante.
- métabolisme : Azote, Glutamate-ammonia ligase, Nitrate reductase, Nitrates, Populus, Xylème.
- pharmacologie : Cytokinine, Glutamine.
- Facteurs temps.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Glutamate-Ammonia Ligase, Nitrate Reductase, Nitrates, Nitrogen.
- chemical , pharmacology : Cytokinins, Glutamine.
- drug effects : Plant Roots, Populus.
- metabolism : Populus, Xylem.
- Time Factors.
Abstract
The present study shows for the first time the influence of exogenously applied amino acids and cytokinin on the physiological and molecular aspects of N metabolism in poplar trees. In a short-term feeding experiment, glutamine or trans-zeatin riboside (tZR) was added directly to the nutrient solution. NO3- net uptake declined significantly in response to both treatments. Feeding with glutamine brought about an increase in concentrations of different amino compounds in the roots (glutamine, glutamate, alanine, gamma-amino butyric acid (GABA) and NH4+, which negatively correlated with the net NO3- uptake. The plants showed a reduction of cytosolic glutamine synthetase 1 (GS1) transcript level in the roots. In addition, glutamine feeding changed the root-to-shoot distribution on N assimilation in favour of the leaves and plant internal N cycling. tZR treatment resulted in expansion of zeatin-type (Z-type) cytokinins in the roots and increased nitrate reductase (NR)-mRNA level. The results indicate that both particular amino acids and active cytokinins are involved in the feedback regulation of N uptake and metabolism in poplar. We propose that inhibition of N uptake by cytokinins in poplar is more complex than that mediated by amino compounds, and other effectors are involved in this regulation.
DOI: 10.1111/j.1365-3040.2006.01507.x
PubMed: 17080950
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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In a short-term feeding experiment, glutamine or trans-zeatin riboside (tZR) was added directly to the nutrient solution. NO3- net uptake declined significantly in response to both treatments. Feeding with glutamine brought about an increase in concentrations of different amino compounds in the roots (glutamine, glutamate, alanine, gamma-amino butyric acid (GABA) and NH4+, which negatively correlated with the net NO3- uptake. The plants showed a reduction of cytosolic glutamine synthetase 1 (GS1) transcript level in the roots. In addition, glutamine feeding changed the root-to-shoot distribution on N assimilation in favour of the leaves and plant internal N cycling. tZR treatment resulted in expansion of zeatin-type (Z-type) cytokinins in the roots and increased nitrate reductase (NR)-mRNA level. The results indicate that both particular amino acids and active cytokinins are involved in the feedback regulation of N uptake and metabolism in poplar. We propose that inhibition of N uptake by cytokinins in poplar is more complex than that mediated by amino compounds, and other effectors are involved in this regulation.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">17080950</PMID><DateCompleted><Year>2006</Year><Month>11</Month><Day>28</Day></DateCompleted><DateRevised><Year>2019</Year><Month>11</Month><Day>10</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0140-7791</ISSN><JournalIssue CitedMedium="Print"><Volume>29</Volume><Issue>7</Issue><PubDate><Year>2006</Year><Month>Jul</Month></PubDate></JournalIssue><Title>Plant, cell & environment</Title><ISOAbbreviation>Plant Cell Environ</ISOAbbreviation></Journal><ArticleTitle>Exogenous supply of glutamine and active cytokinin to the roots reduces NO3- uptake rates in poplar.</ArticleTitle><Pagination><MedlinePgn>1284-97</MedlinePgn></Pagination><Abstract><AbstractText>The present study shows for the first time the influence of exogenously applied amino acids and cytokinin on the physiological and molecular aspects of N metabolism in poplar trees. In a short-term feeding experiment, glutamine or trans-zeatin riboside (tZR) was added directly to the nutrient solution. NO3- net uptake declined significantly in response to both treatments. Feeding with glutamine brought about an increase in concentrations of different amino compounds in the roots (glutamine, glutamate, alanine, gamma-amino butyric acid (GABA) and NH4+, which negatively correlated with the net NO3- uptake. The plants showed a reduction of cytosolic glutamine synthetase 1 (GS1) transcript level in the roots. In addition, glutamine feeding changed the root-to-shoot distribution on N assimilation in favour of the leaves and plant internal N cycling. tZR treatment resulted in expansion of zeatin-type (Z-type) cytokinins in the roots and increased nitrate reductase (NR)-mRNA level. The results indicate that both particular amino acids and active cytokinins are involved in the feedback regulation of N uptake and metabolism in poplar. We propose that inhibition of N uptake by cytokinins in poplar is more complex than that mediated by amino compounds, and other effectors are involved in this regulation.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Dluzniewska</LastName><ForeName>Paulina</ForeName><Initials>P</Initials><AffiliationInfo><Affiliation>Chair of Tree Physiology, Institute of Forest Botany and Tree Physiology, University of Freiburg, Georges-Köhler-Allee 53/ 54, D-79085 Freiburg, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Gessler</LastName><ForeName>Arthur</ForeName><Initials>A</Initials></Author><Author ValidYN="Y"><LastName>Kopriva</LastName><ForeName>Stanislav</ForeName><Initials>S</Initials></Author><Author ValidYN="Y"><LastName>Strnad</LastName><ForeName>Miroslav</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Novák</LastName><ForeName>Ondrej</ForeName><Initials>O</Initials></Author><Author 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IdType="pubmed">17080950</ArticleId><ArticleId IdType="doi">10.1111/j.1365-3040.2006.01507.x</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Allemagne</li></country><region><li>Bade-Wurtemberg</li><li>District de Fribourg-en-Brisgau</li></region><settlement><li>Fribourg-en-Brisgau</li></settlement></list><tree><noCountry><name sortKey="Dietrich, Henriette" sort="Dietrich, Henriette" uniqKey="Dietrich H" first="Henriette" last="Dietrich">Henriette Dietrich</name><name sortKey="Gessler, Arthur" sort="Gessler, Arthur" uniqKey="Gessler A" first="Arthur" last="Gessler">Arthur Gessler</name><name sortKey="Kopriva, Stanislav" sort="Kopriva, Stanislav" uniqKey="Kopriva S" first="Stanislav" last="Kopriva">Stanislav Kopriva</name><name sortKey="Novak, Ondrej" sort="Novak, Ondrej" uniqKey="Novak O" first="Ondrej" last="Novák">Ondrej Novák</name><name sortKey="Rennenberg, Heinz" sort="Rennenberg, Heinz" uniqKey="Rennenberg H" first="Heinz" last="Rennenberg">Heinz Rennenberg</name><name sortKey="Strnad, Miroslav" sort="Strnad, Miroslav" uniqKey="Strnad M" first="Miroslav" last="Strnad">Miroslav Strnad</name></noCountry><country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Dluzniewska, Paulina" sort="Dluzniewska, Paulina" uniqKey="Dluzniewska P" first="Paulina" last="Dluzniewska">Paulina Dluzniewska</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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